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Fencer Vulns
high 7.5

CVE-2020-29363 json

An issue was discovered in p11-kit 0.23.6 through 0.23.21.

published 2020-12-16 5 y ago modified 2026-10-14 26 d ago also EUVD-2020-21737

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

An issue was discovered in p11-kit 0.23.6 through 0.23.21. A heap-based buffer overflow has been discovered in the RPC protocol used by p11-kit server/remote commands and the client library. When the remote entity supplies a serialized byte array in a CK_ATTRIBUTE, the receiving entity may not allocate sufficient length for the buffer to store the deserialized value.

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • p11-kit Debian 14, Debian 13, Debian 12 0.23.22-1

debian advisories DEBIAN-CVE-2020-29363

  • p11-kit Ubuntu 18.04 LTS 0.23.9-2ubuntu0.1
  • p11-kit Ubuntu 20.04 LTS 0.23.20-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-29363

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • p11-kit RHEL 8 0.23.22-1.el8
  • p11-kit-trust RHEL 8 0.23.22-1.el8
  • p11-kit-server RHEL 8 0.23.22-1.el8

red hat advisories RHSA-2021:1609

  • p11-kit AlmaLinux 8 0.23.22-1.el8
  • p11-kit-trust AlmaLinux 8 0.23.22-1.el8
  • p11-kit-server AlmaLinux 8 0.23.22-1.el8

almalinux advisories ALSA-2021:1609

  • p11-kit Rocky Linux 8 0.23.22-1.el8

rocky linux advisories RLSA-2021:1609

  • p11-kit Alpine 3.10 0.23.16.1-r1
  • p11-kit Alpine 3.11 0.23.18.1-r1
  • p11-kit Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 0.23.22-r0

alpine advisories ALPINE-CVE-2020-29363

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • p11-kit Arch Linux 0.23.22-1

arch linux advisories AVG-1355

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-29363 updated cvss 7.5

p11-kit: out-of-bounds write in p11_rpc_buffer_get_byte_array_value function in rpc-message.c

  • Red Hat Enterprise Linux BaseOS (v. 8) p11-kit 0.23.22-1.el8, p11-kit-trust 0.23.22-1.el8, p11-kit-server 0.23.22-1.el8
    fixed: vendor fix RHSA-2021:1609
  • Red Hat Enterprise Linux 6 p11-kit, p11-kit-trust Red Hat Enterprise Linux 7 p11-kit, p11-kit-trust
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 7.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

3.53% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.